1. Communication of audible signals encoded in electromagnetic waves. 
   无线通讯以电磁波密码进行的可听信号的联络
2. Providers can ensure video quality by applying algorithmic compression techniques such as chroma subsampling, which uses color variation undetectable to the human eye. 
   供应商通过应用诸如色彩子取样等算法压缩技术确保视频的质量，所谓的色彩子取样使用了人眼观察不到的颜色变化。
3. Scrambled data is encoded using a secret key unique to that transmission. 
   保密数据利用对这次传输独有的秘密密钥进行编码。
4. Analog information is converted into digital information, which is then encoded onto the disc. 
   模拟信息被转换成数字信息，然后这些信息被编码在光盘上。
5. Digital data are encoded by means of pits on the recording layer of the disc. 
   对数字化资料进行编码，是通过光盘记录层面上的凹坑来实现的。

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